I've set up a website for county departments to post their own information to the county website. Things are pretty good, except people repeatedly post links to PDFs and the like using the "Attachment Post URL" button instead of straight to the file URL.
I've found a way to remove this button in the media.php file under wp-admin\includes, but I really don't want to modify a core wordpress file.
Is there a way to disable or hide this button without changing core wordpress files? If so, what file do I need to modify, and what do I need to change?